Muscle is the fibrous tissue in the body that has the ability to contract (when asked to do so by the brain). When a muscle contracts, it shortens (becomes smaller). Muscles are attached to the bones of our skeleton (through strong fibres called tendons). So, when the muscle attached t...
Smooth muscle is found in the walls of hollow organs like your intestines and stomach. They work automatically without you being aware of them. Smooth muscles are involved in many 'housekeeping' functions of the body. The muscular walls of your intestinescontract to push food through your body....
Phase 3: Orgasm.Sexual excitement reaches its peak. You feel a series of intense muscle contractions as your body releases the tension. The muscles of the vagina and the uterus contract. Muscles at the base of the penis tighten and release, releasingsemenin an ejaculation. Phase 4: Resolution...
The muscles located in the atria that contract are called the pectinate muscles. These muscles form parallel ridges on the inside of the atria that...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough ...
‘Botulinum toxin is used as an injection to treat fine lines and wrinkles and other issues that can arise from muscle movements. When muscles contract in the body our nerve endings require a chemical messenger called acetylcholine which is a neurotransmitter, to pass through the receptors of the...
Both adrenaline and cortisol are made in your adrenal glands and released into your blood when you have a stressful experience. But your body releases these different hormones at different times. Your body releases adrenaline at the beginning of your stress response, and it's main effect is to...
OAB is a sudden urge to urinate that is difficult for you to control. It occurs when the muscles of the bladder contract (tighten) more than normal. This causes a frequent or sudden need to urinate. You usually have to urinate more than 8 times in 24 hours. You may need to get up ...
Potassium is a positively charged electrolyte. When it dissolves in your bodily fluids, it helps carry an electric charge. Your body needs potassium to function correctly. It helps:• Muscles in your body, including your heart, expand and contract.• Nerves send signals.• Move waste ...
What happens in the vascular phase? What prostaglandin is released that helps with vasoconstriction? What happens between the alveoli and the pulmonary capillaries? (a) Mention the 4 valves of the heart. (b) What is the function of these valves? (c) What happens when the valves do not clos...
How is a neurotransmitter released? How are two myosin molecules bound together? How do the contraction mechanisms of smooth and skeletal muscles differ? What regulates smooth muscle contraction in the absence of troponin and tropomyosin? What is the role of T tubules in contraction? Explain the ...